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Discussion Starter #1
And where does it connect?

I can't seem to locate it on my wonderful papjam wiring diagram....it could certainly be user error.

Thanks, JP
 

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That's the low pressure cutoff switch, meaning the switch will close and power the compressor clutch once the minimum system pressure has been reached (seems to be ~ 5-9 psi). However, the switch you have is not OEM original; somebody found a replacement, likely because the original switches fail over the decades and no longer make consistent contact when pressurized.

I've tried pretty hard to find a replacement for the OEM one in the USA, but have not found a source. The thread pitch is different than most other switches with the same thread diameter. Thus, I keep the switch wires permanently jumpered with a piggyback spade connector.

The standard Montreal wiring diagram does not address the A/C system. The one that claims to cover the A/C is not 100% accurate. The official early Alfetta wiring diagram (with A/C) gives the best representation for the Montreal's A/C system, as the two are very similar.

Finally, a good belt size is a 10mm wide x 975 mm long belt (x2), which will put the compressor just past the midway point of its slot free travel.
 

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Discussion Starter #4
Thanks for the feedback, Hans! I appreciate the info.

Alex, let me get back to you on the switch. I am going to a more modern Sanden compressor so may have a different interlock to tie in to.


JP
 
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